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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f29b1f125369c36437e9c560e2f340b12be8832a3bf6ce42ba3c5ade0f0cb3ed' 
  AND token = 'W+kQ/UPn4EEZyrV8x4g3KcWw/a5/5v73B5urVyQpRP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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