SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a63b043fc9ceac9f7c8f841fd31f0720164ae64b70fa4afd0231b596fcf52b5' 
  AND token = 'W4of+GQEWrphys7tUz2vO/l0j/XxCdT9LpMpQqRVHJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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