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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '723d7afc1c08921451c7cc3024a6826b8f5b3c79989787b5a3687f8a07f3244a' 
  AND token = 'kESS5PaS05axHzVrMq9tnhZtIGPvq4cvCf3JZcB8NTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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