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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ed527304996488aed3dc780a90f43851530989ace92ec745d2a760d333c3c3e' 
  AND token = 'Q7tSO2NVsFFvRc9mYIAzgVcn7kNmw+o9Gv7JgNH5hGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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