SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2c36fab5b9d87db8733c3556a344fbe2e39ec789a62cfd9771b86f1a2c6f3a' 
  AND token = 'J0jAq5kgqgVKl8YmOIvx7MCyKR72YJCaq+Lc3ZHNiLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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