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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58c66a753e8ee2e5ff0afaac3e4e9e28c6b869c29fd89fbd497a66f11bbd050d' 
  AND token = 'FrLTXIrBcCNb7UwgBjvRtodHDOdP2DWJMzPF4kcL2B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}