SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ccbf2b2300e0d58880b2b4a8787457c2aae6dae424034b1ee432f925cfddfe1' 
  AND token = 'hqC1X/IGm6mzrbWMmmJ+ZC8jnEokvxPw4taeUARay/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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