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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5f5606c3d9c5ace11fe4c9f82cd26f7c4b87fdd9eb7cc7418b40c608cac3c75' 
  AND token = 'UbnJN0Tr6qUyg6vuJXlderxLeEHEHHwGXkv7eHKhB2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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