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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c7bea1ddd8ea4c956b4f953233e96588fef2e004b57d9adcc51d02aaf6c755b' 
  AND token = 'NHm4FTarN6riO3b/Eyy48h8SrsNtdwpl++eW1Z3dUd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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