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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5284ce91c0a638791d293b9a83955eba0df572b04e1e009b8eae18d6b04a09a6' 
  AND token = 'v7AgDFz2LETvm/wBf4RdvAbs9qBrDlTn+braIZs1xpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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