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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '582e1fba654fae6ad1f510dddc61d144cbca57970dd1e58da8ef3d99364c2f95' 
  AND token = 'BSK6Eo6y2LrLtOo71thK2ZJKzz9IIKByppNAu+XUGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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