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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '344eb5cc3d7a07227e5137c6c75bc0e42f742fffb4e004a2e1d68d64fe9ae82f' 
  AND token = 'c6NpV6GaOwpoRPFRmxmPMK8j74YsLW+TQDBU4GKWOJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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