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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff8d5d6aa1cb7a2ab64f104d0279d9fa10fc61708d2b1501dae7dde920752604' 
  AND token = 'AGaO5VEd/JXg0kvh5OJzaeyMxsm7kWQPNvcZDLzlB7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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