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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09de71fe851915e7759aa115baa94babc3e14e2b80305bd693ee1da8a6deb24f' 
  AND token = 'vWci+BL5SCH5eLp6trn72Y5YE5mTpsyCJY2e/w9rJp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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