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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c1b406e44040b345cb9ddbcf2cd27df91f97e4dea4bc80c52884e0cf56f08e7' 
  AND token = 'XIXYC6JY2MpzWhBVDvg1H2bo81s3EZddeaLs41UfPrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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