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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '478a31ad9f37760a6eb1e99d8fe83f2a3b19d8e53eeda3cc5a73ae0a1e1806da' 
  AND token = '3ZYEjF68++9CgJXJKpVx+dtgGb2Ysh9lTKkjd0ILCuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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