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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ed72d88872df420f3957d693fef629fe262f7a6cfe363688b7c1f38dce039d3' 
  AND token = '86rZBb7jXZnIcS1CG4eSpYiiSVwsEsy7rIAeuOF+YMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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