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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aa5122ab34a3c605fcbc820a637ec7ee5c8ff0f5faa70f8d5198e93707d207f' 
  AND token = '5G/8NTK2FrQAQObhLIQ57kkia21xCsWGBzIc/PM2OT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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