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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c089a9c79bed49825d4f524782b39dbea9b3a629ddbb9a2b8620c290333fb7' 
  AND token = '5T9CGmWey2a7A5CTge3+umf+eRBGsBtF6BM/wwDkP1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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