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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eaf9d8b1da6a719668f87d8593f0678f65cdbbbf1e2386ea218fb5b893df1de' 
  AND token = 'EPWUBzjFyTI/jrPALIryQGSYU+cNB4MLr7tor5Cbqc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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