SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1f9f6feb1c1bdfdf4bf4799b92221690430dccaf023a0797f4613052c43305b' 
  AND token = 'voG3pu3OLXNQZcAwl4t70q3AAKJB9cEDh88OUgAx7mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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