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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e19f9a96b2648fcbdfe7d9666170c148b41521db3d6d45a5cc0672e48589591e' 
  AND token = 'f1P9UWxy1q069Ttv0oBUpMqewidNb4GvnsOa9L10eMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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