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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '610f6c9a5ffa8dc3f0badd02ea6dd73987381b15dfc97e5f40039cda73d24c71' 
  AND token = '8js2knoRusn7oxaj/pSYYbGS59dZ67uiYU0eqTmzGp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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