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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6aaa897fe03c20aa586c7fe930c64bfd7ee5cbc1ddd96ea254dddacf70c33c4' 
  AND token = '6XHf3nVSfkVO7VYiuShp3c7OqghRBRmkab1kHmVcuNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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