SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78d920cf026a597b661349d2e8894bdc9f1e0c30f06381d5d6afb833ad58056a' 
  AND token = 'AIclYOA2Gv8fH2VH5K4JVzCXehEb3AojO3MIEf02ggY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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