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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '964aec2a2c531e1017783d04e0b4dc8f36f7d4f682d3307766966c6b0144c1fd' 
  AND token = 'NREvLrJvItNZQR+E91aPpbu1RYmlw9Q/bQ6S7fQgV1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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