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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d4d02cefacc3c3954351838ab822444a241aa241ff0c1a6d42c1997c7af9725' 
  AND token = '7K5M6BVQTIMDRIWd/qp64RADgV4M+ObQgLQabntreXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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