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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ea3e9b3d55e4b42df411f7ba39a7fba53413da898fe2b5f550784adec64afa3' 
  AND token = '9qZB4utFR08U9xIvZPLD4FPfnJdmWIP0/I3FSlJ8fiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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