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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa2768d5313600b66952db6b6261279491d4513b5cd02a523bac21abbc5fd893' 
  AND token = 'KplvOn5/Rdo+YM4LZd2sco2R74/UMwUJ2hCuKdRml5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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