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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '002f5f9f26d957acc3019165f78b6127a1390639378e8343cf813cac7ce7c92b' 
  AND token = 'hCPhEr/3sk/SCckgYfXr3VszivJkZPEZ4f56TFEpgpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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