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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b54f05be1a3d7f3b43d3bc502f14c6c5acd021268672952d9ff66d757194a1b9' 
  AND token = 'ui7B7j1wz/EjLEpsIZ25eSpdz4MdmxKUiSCXrtHafUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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