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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df8efe8fc2d165fdfac0d1fb7c354e6e351876a23e6930d7305b3a110a8d4620' 
  AND token = 'HgzVDgBdRX9SIghsybTx2dMq43pF/W4dbqGfoxtsb8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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