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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6e203cbda0d91ddf0b5ec3d6f98959fe782856e0f287bacab2ffc6cfbe7a67c' 
  AND token = '8wOvdi71MCVWAxbNvpzNBNwgkP2Ft03dxL4eALTuY+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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