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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '618e7cbba08318c8f80ebf8e8cc0330a0828309fd554e15fd700884bed3b1a2a' 
  AND token = '8tWk+p2rKnR2/XGd7xOWg0Ecc8wKdjFCBbSAsUfQPO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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