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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94626d86f260a336a6bf05f2bdebf51ae4c15bac7657ee98bc334ce03bfb93e' 
  AND token = '6eZeeNrOOZsSI8JIkd8zgulKIpOkbRIZIj/29HTzXQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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