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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a664320fc650e4a1d025b9f69866975938deb1078d8e5e3bf4e93f4a0f57452' 
  AND token = 'F1MuIt2OeXue3wOQRP+GfCINyVu3PZuVtj7E1dlovLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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