SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7f3ff31537b55d6a3b04a310a50522b41381892c3e24baf621c86e6a592fb81' 
  AND token = 'p6BNGYXhM0I22omxzJlTumvS8Z5b1R1oS+saY9OwFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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