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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cb6269c626dca029ec90e93a0fd5b7eab1ccd6f5aee74ff7f9df102e9276319' 
  AND token = 'QHMoyJIuOQL6Jk5Mnj6ToBZ4jgA20yGCaAaUn/5tpoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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