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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64e09796a6ea3c61190edd3ab495c0fc2f6c224da096f9e2213fd942df0846ab' 
  AND token = '7L9+SftK5mzawz7Dq9D4RdcVNGCqxoDw9Z9ra+ZzuB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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