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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae1a442e9647d9da8875df76bd51a8f347ac868e481c302ea4d98ecf08cb1de9' 
  AND token = 'aTrlrDXqCm+1ogxRx1bscGeavlpa3B5OU0Km95Lpzp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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