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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8eb9c3cf6c7607a5e0ade5045193333047f0fbc5a9a2099d2b95fc948dbba4d' 
  AND token = 'k9Fhapq4gI+hsCySk13tCw9scstgnc29vH6phqoHEl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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