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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80e8ad218ab7acfb1c87a3000688cf12ebbc12e05a0ebf2de804787bc8a23cb2' 
  AND token = 'Xzd57lTx7uSNM9KtMwlSJcA3IvgAqfn5EsQV9fdc6dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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