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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adc7ed607d12f7a7dfb42603ce84a81df8f039cdc11a89286457c81f862ae83d' 
  AND token = 'OKzh/EzrD0UnIcBTp1Dku58W/YJ6T2SlbVaW3PblPe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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