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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b6ea915f6c8ea32ea14c4838176bfacab5eca22e7979e670dfdc7eaf0441de' 
  AND token = 'xl66CSNMsjVXfK1nWYkzds8S+DxEwVG94vd+51Jzi3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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