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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94f1575f6d8977a3e4cfed5ebd0e714967d3742bcd2ccef10f872a695675a6cf' 
  AND token = 'Sv4sfiSCvgSa9ZVMJySfREPCf/lult34Ez8h6Gvsm0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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