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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8d92f51d32798d7742d768548a96a1b76f08818c5cb7a5d088a8ff59aa38d77' 
  AND token = '7BddMFT78CUpDsNovjc6lK7NzNrPlEArcKnpwFvMRDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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