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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad99ef0acd9b2ef4076ff6bc1499f95c218013656ef03ea80b4a18adc196acbd' 
  AND token = 'I/gMwMtipG+OTw19gqx/Eo/Eeb1M5ouV/LBPI+PhpXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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