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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f6b394ed3dabd5046a7586ae9bbe6ef3cceefc44bba4901992e8d296e5b7dd1' 
  AND token = 'XRYr418720qc+hAyb3teT/Js/mMrZVz4Sec+pGPEULM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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