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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3e93953f9755b81f08f6cd8fb886414ad560558faf12afb3b2455a1d3e7e8dd' 
  AND token = 'qUaL3lJsBMsmxWVdl2yD5MY0hd/92L8hyJknbVwbc8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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