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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2be6d5b9dd64592eea92abead50b19b61b4e7583971ac373f37d084b31eb3b07' 
  AND token = 'vPmNm+TyRNPb1okf6XTIseRtfr0CWOtqu8JfGlCFkfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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