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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7347bf3024e8e51d37f031ac22ee24eef6155c7743f5e16aeda8d25ba773f76' 
  AND token = 'B5huyEHef1YQNgV0fJVuFCDWR88BJYOVwZxkZXBV0KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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