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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5bc05e8e6768a0d57722d9e9197d5f7a2d3285c94aaae53d06e1ed7f41c52ab' 
  AND token = 'tcEucHdtOqqDDFKxFVgcZBrzMW6EvI6s+Peexn2F8Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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