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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aec37a464b48c78a473fc109b1a9f979cb0193e9b7be9ec7cad1e160bf84d835' 
  AND token = '92K/17nEgfvIMZxM6NGn+Dw1yvaa5LEDrA9rvJiJyUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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