SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaf18b7986fd2e248d7932fdf4f43f2f75e980a06c59fd5116c85f387e7d3b70' 
  AND token = 'I5mFvfVHhjXy6uu0OkAgMfMz/69I0q14VhXLWEuh5Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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