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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17bf3fdb5eb516fe8e868c3092691eb25cc48ccc5acb2d0043e97e580425b375' 
  AND token = 'PtsnBUzxMl7QQSKLReKathgavglqKzA7F4zxtxGM84E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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