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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c85ecc1635e9473e551aa1558b5bbb0c5f85b6ce852f93bf795f2dc3ca6fba92' 
  AND token = 'iQTN1qBs8X8cQ9QVDm5u5H9aCwlGFMpebPjtWMbpif0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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