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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '668d37afb957ed2aa6596368ac69385e35fbaa045ffc5f2c0c4a2bb1156ad971' 
  AND token = 'byF/Y+aN9Tb68f+F8/gozUx/ba/1JS8tfNfubjCXCOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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