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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed2a76931858f18031ef7c8165927d60a9326eae39c9e766a58acd08862d7f23' 
  AND token = 'ajMu5Lb1BxFXOGf7SZoD2NED7uc6k5JGVNcHB04Mrgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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