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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faaeeab46d38ec1b4ab570370700a25f37443ffa7a48173602616c6b9b832685' 
  AND token = 'ZfSZ21gpAVjcKTaTeB7eplERWRNa8BNVwf/QopSsqhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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