SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5d941062e40f42d3251f2b109944fb39c63887958b081f2507e38a7befe3d44' 
  AND token = '7PvHBPGqjT4og6BoOeCu9lm8D3YZG/o16pG650omvro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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